/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/Widgets/SNiagaraFilterBox.h
If true, will set the parameter to the currently active tab. If false, the template filter wasn't initialized with any tabs.
bool GetActiveTab ( [ENiagaraScriptTemplateSpecification](API\Plugins\Niagara\ENiagaraScriptTemplateSpecificat-) & OutTemplateSpecification ) const